Surgery – Truss – Pad
Patent
1983-07-28
1985-06-04
Howell, Kyle L.
Surgery
Truss
Pad
324306, 324309, A61B 505
Patent
active
045208280
ABSTRACT:
A method and apparatus for determining the rate of flow of a liquid in a selected region of a body by nuclear magnetic resonance techniques. The method includes a sequence of applying a first magnetic pulse (B.sub.1 (90.degree.)) effective to excite nuclear magnetic resonance of a chosen nucleus within the liquid preferentially in a slice of the body which includes the selected region. A period of time (t.sub.D) is waited and then a second magnetic pulse (B.sub.1 (90.degree.)) is applied which is effective to excite nuclear magnetic resonance of the nuclei preferentially in the slice, and the free induction decay signal is measured. The whole sequence is repeated for different values of the period of time (t.sub.D). The values of the period of time (t.sub.D) and the corresponding measured signals are then related to the rate of flow of the liquid through the slice.
REFERENCES:
patent: 4354499 (1982-10-01), Damadian
Singer, Jr., NMR Flow Imaging, Proceedings of an International Symposium on NMR Imaging, Bowman Gray School of Medicine of Wake Forest Univ., Winston-Salem, N.C., Oct. 1-3, 1981.
Battocletti, J. H., "Flat Crossed-Coil Detector for Blood Flow Measurement Using Nuclear Magnetic Resonance", Med. & Bio. Engr. & Comp., Mar. 1979, No. 2, pp. 183-191.
Burl Michael
Young Ian R.
Howell Kyle L.
Jaworski Francis J.
Picker International Ltd.
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